Bugzilla – Full Text Bug Listing
| Summary: | [null] Wrong report of Potential NullPointerAccess | ||
|---|---|---|---|
| Product: | [Eclipse Project] JDT | Reporter: | kurt <kurt2002> |
| Component: | Core | Assignee: | Stephan Herrmann <stephan.herrmann> |
| Status: | CLOSED WONTFIX | QA Contact: | |
| Severity: | normal | ||
| Priority: | P3 | CC: | kurt2002, srikanth_sankaran |
| Version: | 4.3.1 | ||
| Target Milestone: | --- | ||
| Hardware: | PC | ||
| OS: | Windows 7 | ||
| Whiteboard: | stalebug | ||
For your information - bug is still present in Eclipse 4.5M2: Version: Mars (4.5) Build id: I20140918-0330 This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie. |
Following three examples, where a worng PNPA is reported. static void potentialNPAccess_1() { final Vector<Component> vo = new Vector<Component>(); // --- wrong PNPA only occurs if variable declared here AND set to null Component c = null; for (final Enumeration<Component> e = vo.elements(); e.hasMoreElements();) { // --- no PNPA if declared like this // final Component c = e.nextElement(); c = e.nextElement(); // --- "||" neccessary to have the wrong PNPA ! if ((c instanceof JTextField) || (c instanceof JPasswordField)) c.setEnabled(true); // XXX wrong PNPA on c } } static void potentialNPAccess_2(boolean b1, boolean b2, final Object o1, final Object o2) { final Iterator<Object> it = new Vector<Object>().iterator(); // --- wrong PNPA only occurs if variable declared here AND set to null Object ox = null; do { // --- no PNPA if declared like this // final Object ox = it.next(); ox = it.next(); if (b1 && ox.equals(o1)) b1 = false; if (b2 && ox.equals(o2)) // XXX wrong PNPA on ox b2 = false; } while (it.hasNext() && (b2 || b1)); } static void potentialNPAccess_3(final boolean b1) { final Vector<Component> vo = new Vector<Component>(); // --- wrong PNPA only occurs if variable declared here AND set to null Object o = null; for (int i = 0; i < vo.size(); i++) { // --- no PNPA if declared like this // final Object o = vo.get(i); o = vo.get(i); // --- uncomment next line and the wrong PNPA disappears // final boolean b3 = o.equals("x") || b1; final boolean b2 = b1 || o.equals("x"); if (b2 && (o.hashCode() == 1)) // wrong PNPA on o System.out.println("x and hc=1"); } }